Cable-hoist.



L. COBB.

CABLE HOIST.

APPLICATION FILED JUNE 19, 1911.

Patented July 28, 1914.

Inventor vAriorneys Witnesses ThE NQRIIS PETEPS 60,. PHOTO-LITHQ.WASHIN57UN,'D. C,

UNITED sTATEsPATENT OFFICE.

LUTHER COBB, 0F OVOLITIC, INDIANA,"`ASSIGNOR`OF` vONlleFO`l'J"R.'1I-I TOWILLIAM E.

CLARK, ONE-FOURTH T0 ASA C. CLARK, AND yONE-HALF TO CURTIS TODI), 0F

LAWRENCE COUNTY, INDIANA.

CABLE-Hoisr.

Patented July 28, y1914.

1 Application led .Tune 19, 1911.- Serial No. 633,969'.

To all whom t may concern Be it known that I, LUTHER COBB, a citizen ofthe United States, residing at Oolitic, iii the county of .Lawrence andState of Indiana, have invented a new and useful Cable-Hoist, of whichthe following is a specification.

This invention relates to improvements in cable hoists, the primaryobject of the' invention being the provision of a gearless cable hoist,in which the main lifting member comprises a seriesof integral or keyeddrums, said drums having the same axis but being of different diameters,the drums being preferably three in number andwith the tread of thecentral one just sufficiently `large to guide a single strand of rope orother exible cable.

A further object of this invention is the provision of a gearless hoist,having a main frame in which is journaled a series of three differentdiametered drums, keyed together for simultaneous lrotation and providedwith a drive chain receiving pulley for rotating the same, the outerdrums of the series having they ends of the ileXible connection or ropeconnected thereto while the inner drum is of only a sufficient size toaccommodate the passage of a single strand of said flexible connection,the said flexible connection being so th-readed as to pass from one ofthe drums around a single pulley of a double sheave upwardly and overthe central drum and down and around the remaining pulley of the sheaveand up to the other outer drum of the hoisting mechanism. By thismechanism the heavy gears and heavy chains used in connection with mostof the cable hoists is dispensed with, and a very light, simple anddurable mechanism is provided.

With the foregoing and other objects in view which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, ity being understood that changes in the preciseembodiment of invention herein disclosed can be made within the scope ofwhat is claimed without depart-ing from the spirit of the invention.

In the drawings-Figure 1 is a front ele- -vation of the complete devicein operable position, the cable being wound upon the vsmaller `drum andready for movement to be unwound therefrom n `upon the larger drum. Fig.21s anend View taken from the direction of the arrow in Fig; 1. y F ig,v3 y is a transverse'cross sectional view through the kthree drums andoperatingpulley thereof.

' designates amain supporting frame or yoke Referring to the drawing,the numeral provided with the downwardly yprojecting `eyed arms 2 forthe'` reception ofthe cylindrical shaft 3 of the mainhoisting device.

` Thisgmain'hoisting device, as clearly shown,

comprises the 4outer or drum 4 provided with the circumferential rims orflanges 4 and 4, the mainforjlarger Adrum 6 which is of a largerdiameter, but

of substantially the same .4, andiis peripheral flanges or rims 6 "theinner Hanges 6 and 4 of the respective drums or spools, providing theinner or clamping drum 5,providedwith a single groove as at a for thereception of a single strand of the hoisting cable or rope 10. Asclearly shown in Figs. 1 and 2 of t-he drawings, the cable 10 h-as oneend connected first to the body of the spool or drum 4, as at 9, andsufliciently of the cable is wound thereon to fill the ysame smallerdiam'etered y length as the drum l provided with its circumferential asindicated in Fig. 1. yThe cable is now f passed downwardly, and over thesheave or pulley 11 journaled in the sheave frame 12,

and then passed upwardly, as indicated byk the arrows and over theintermediate v' grooved pulley 5 and down again where it is threadedover the pulley 13, mounted in the sheave 12, and again carried upwardlyand connected at 14 centrally of they body of the drum 6 near the innerrim or Harige 6.

Mounted upon, so as to rotate the shaft 3` and exterior of the frame 1,is a chain actuated pulley 7 over which passes the operating andcontrolling chain 8.

ln constructing this device, the drum 6 is preferably of substantiallythe same diameter as it is of klength between the flanges 6 while thedrum 4 is substantially one half of the diameter of the drum 6. Thediameter of the drum 5 Lis intermediate of the diameters of the drums 4and 6, that is should the drum 6 be siX inches in diameterv the drum 4three inches iny diameter, the drum 5 would be approximately four inchesin diameter.

The object to be lifted or hoisted is connected to the hooked end of thesheave 12 and the cable 8 is operated so as to rotate the shaft anddrums in the direction of the arrow Fig. 1 thus winding the cable 10upon the drum 6 and simultaneously unwinding the same from the drum 4,the portion of the cable between the two drums l and 6, and upon thedrum 5 moving relatively fast, and as the drum 6 is of twice thediameter of the drum 4, one rotation thereof, will take twice as muchcable up upon the said drinn 6 as will be unwound from the drum 4, thusgaining each rotation of the shaft the difference between the amountwound upon the drum 6 and that wound from the drum 4, that is the'pulley sheave l2 would be lifted one fourth the height of the amount ofcable wound upon the drum 6, thus gaining each rotation thereof so thatthe sheave 12 may be lifted to the desired height. By means of the drum5, the sheave 12 with its weight kmay be retained in any desiredposition, and

when it is desired to lower the said weight carried by the sheave l2, itis simply necessary to rotate the chain 8 in the opposite direction tothe arrow shown in Fig. l and the respective drums will be rotated sothat the sheave will be lowered and the weight or article carriedthereby deposited at the desired place.

From the foregoing description taken inA connection with the drawings itis evident that an extremely simple device for hoisting l is providedand one wherein the services of gears and heavy chains is dispensedwith, the simple employment of a series ofl three horizontally disposedand different diametered drums, accomplishing the same results andVproviding a means easily moved about.

` Vhat is claimed is:

In a hoist, a supporting frame having two apertured terminals; anintegral rotatable member forming two drums of varied diameters, anintermediate pulley of an average diameter, each of the drums beingprovided with two circumferential rims, the rims adjacent the pulleyacting as the rims for the pulley to assist in maintaining a cabletherein, and two oppositely disposed journaling studs, one stud beinglonger than the other; a block; two independently rotatable pulleysjournaled in the block; a cable having its intermediate portion trainedover the intermediate pulley and over the two latter pulleys, theterminals of the cable be- `-ing attached to the respective two drumsand designed to be wound upon and un- `wound from the respective drums;and an actuating pulley keyed upon the longer stud :for rotating theintegral rotatable member.

In testimony that I claim the foregoing vas my own, yI have heretoaffixed my signa- {ture in the presence of two witnesses.

LUTHER COBB. Witnesses: JOHN H. UNDERwooD, THos. C. UNDERwooD.

Copies of this patent may be obtained for ve centsleach, by addressingthe Commissioner of Patents, Washington, D. G.

